html, body {
  margin: 0;
  font-family: Arial, Helvetica, 'Microsoft Yahei', sans-serif;
  color: #7e8793;
  -webkit-font-smoothing: antialiased;
}

.list-header {
  padding: 0.8rem 1rem;
}

.list-header img {
  height: 1.2rem;
}
.list-header .inner {
  width: 100%;
  margin: 0 1rem;
  background: #f5f8f9;
  line-height: 1.7rem;
  border-radius: 2rem;
  padding: 0 1rem;
}
.list-header .inner input {
  width: 80%;
  border: none;
  background: none;
  outline: none;
  flex: 1;
  color: #7e8793;
}
.list-header .inner span {
  font-size: 1.5rem;
}
.list-header button {
  border: none;
  background: none;
  font-size: 0.9rem;
  color: #5bd4c7;
  flex-shrink: 0;
  outline: none;
  padding: 0;
}

.filter dl{
  text-align: center;
  margin: 0;
}
.filter dl dt:after {
  content: '';
  display: inline-block;
  width: 4px;
  height: 4px;
  border: 2px solid #ccc;
  border-style: solid none none solid;
  transform: rotate(45deg);
  transform-origin: 2px 2px;
  margin-left: 0.3rem;
  transition: all 0.3s; 
}
.filter dl.active dt:after {
  transform: rotate(225deg);
}